The Direct Rendering Manager (DRM) is a component of the Direct Rendering Infrastructure, a system to provide efficient video acceleration (especially 3D rendering) on Unix-like operating systems (e.g. Linux, FreeBSD, NetBSD, and OpenBSD).
It consists of two in-kernel drivers (realized as kernel modules on Linux), a generic drm driver, and another which has specific support for the video hardware. This pair of drivers allows a userspace client direct access to the video hardware.
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